planner: remove the limitation that predicates can't be pushed through Projection on TableDual (#51329)

[ti-chi-bot]

This is an automated cherry-pick of #51329

What problem does this PR solve?

Issue Number: close #50614

Problem Summary:

#35669 disables predicates pushdown on TableDual.
This usually won't cause problems, but when it comes to cases like #50614, many unnecessary predicates with lots of conditions will cause obvious performance regression.

What changed and how does it work?

This PR reverts #35669, which is for fixing #35527.
#35527 itself has already been fixed by #38802, which prevents predicates from being incorrectly pushed through Projection.

As said in #35669, sometimes TableDual doesn't have a schema. This may or may not be considered as a mistake depending on our definition of the semantic of TableDual.
Anyway, TableDual without schema should not cause a problem if the predicates are pushed down correctly.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@93359d2). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: time-and-fate, winoros

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-27 14:00:25.582733446 +0000 UTC m=+2076452.604979829: ☑️ agreed by winoros.
• 2024-03-28 07:24:04.209441895 +0000 UTC m=+2139071.231688281: ☑️ agreed by time-and-fate.